Water system sodium ion battery pack

The utility model discloses a water system sodium ion battery pack, which is characterized in that a battery cover and a battery shell are provided with embedded grooves, so that the battery pack can be integrated into a group in a manner that an upper-layer battery shell and a lower-layer battery cover are mutually nested, and the space utilization rate is improved; a plurality of fixing grooves or fixing holes for clamping the connecting rods are formed in the corners of the battery shell, and a plurality of connecting rods can be configured, so that the stability of the battery pack is greatly improved; each independent cavity is provided with one-to-one corresponding liquid injection holes capable of supplementing liquid, and the stability of the battery can be ensured by independent liquid injection of each cavity; the exhaust valve is located in the center of the battery cover to facilitate uniform exhaust of gas; the wiring surface of the current collecting terminal faces downwards, and the part, excep